3l'6 ORDEB 154. 



9 R. decurreiis Chapm. Culm, leave*, and cymes as iu the last; dplke 1"; act. 



obovate, as long as the setns, the tubercle decurrent on its 2 edges. Marshes, Fla. 



10 R. millacea (Lam.) Culm slender, 3-angled, 2 4f; leaves linear, flat, 6 8' \>\ 

 3 4" : spikes obovate, all pedicellate, in diffusely spreading cymous panicles ; ach 

 round-obovate, little shorter than the solas. Wet barrens, 8. 



11 R. caduca Ell. Culm acutely 3-angled, 1 3f; leaves linear, 23" broad; spikes 

 ovate, large, 4 5", sessile or stalked, in several rather close erect cymous panicles ; 

 glumes caducous ; ach. roundish, i as long as the setae. yVet, S. 



12 R. Rchcenoides (Ell.) Culm 3-angled, 2 3f; leaves linear, 2" wide; spikes (-2") 

 small and numerous, subsessile, clustered, in several paniculate cymes ; sete twice as 

 long as the obovate flat achenium and small luburcle. Bogs, S. 



13 R. pa tula Gr. Culm 3-angled, thick and stout at base, 2 3f; leaves linear, 

 short ; spikes ovate, 2", in several spreading loose panicles ; ach. strongly rugous, 

 with a large tubercle, some shorter than the setae. Ga., Fla. 



1 4 R. Elliottii Gr. Culm solitary, 2 3f; leaves shining, rigid; corymbs 3 or 4. 

 few-flowered, subsimple ; spikes large; ach. minutely rugous, with a very short 

 tubercle, little shorter than the setie. Pine barrens, S. (R. distans Ell.) 



15 R. punctata Ell. Culm 3-angled, 1 2f; leaves lance-linear; corymbs of fasci- 

 cles; ach. rugous-netted, with rows of impressed dots. Marshes, Ga., Fla. 



1 6 R. mierocarpa Baldw. Culm 2f, leretish ; leaves narrowly-linear, setaceous at 

 end; spike turgid-ovate, 1 2"; ach. ovate, flat, minute. Wet, 8. 



17 R. pusilla Chapm. Corymbs 2 3, distant, of minute, scattered ovate, 3-flowered 

 spikes ; ach. lens-shaped, oblong-ovate, white. Woods. S. Car. to Fla. If. 



1 S R. < liapmaiiii Curtis. Corymb capitate, terminal, dense ; spikes with 5 scaled 

 and 1 flower: a,-h. oval, polished ; stamens 1 or i. S. Car. to Fla. IJf. 



19 R. alba Vahl. (Fig. 10.) Culm 1(120'. very sK-nder; leaves linear-setaceous; 

 spikes (Kig. 11) whitish, lanceolate, in stalked, corymbous fascicles; setae 9 12, as 

 long as the ach. (Fig. 1 ) and tubercle. Common in wet shady grounds. July Sep. 



20 R. KiiicMkeruit Carey. In tufts ti Hi', filiform; spikes 1", brown, in 35 

 dense, se.-s-ilc. remote fascicles : seiie 6, as long as the ach. Iron soils, N. J. : rare. 



21 R. capillacea Torr. In tufts, (i 10'. setaceous. :j-anglcd ; clusters of brown 

 spikes mostly >, few-flowered; set;e ti, much longer than the ach. Swamps, M., W. 



22 R. glomerata Vahl. Culms If. leaves linear; fascicles brown, remote, iu sev 

 eral pairs; spikes lanceolate, 2" ; ach. obovate, as long as its tubercle, which equals 

 the ti seta;. In bogs, Can. to Fla. July. Aug. 



23 R. eeplialantha Torr. Culms 2 3f, stout; leaves linear; heads globular, 

 dense, remote, sessile, solitary in the axil or terminal, dark-brown ; ach. round- 

 ovoid, obtuse, half as long as th>? ti setie. Barrens, N. J. 



2t R. Baldwiiili Gray. Culms slender, 2 3f; leaves linear; spikes ovate, in a 

 dense terminal corymb of fascicles ; setae li; stamens 6. Pine barrens, Ga. 



25 It. dodecandra Baldw. Culms rigid, stout, 1 3f; leaves rigid, linear, erect; 

 spikes 4", ovate, in 4 or 5 loose, stalked cymes ; stamens 12 ; seta; ti 12, long as the 

 large (IJ'0, roundish, smooth achenium. Bogs, S. (R. megalocarpa.) 



20 R. tasi-icularls Null. Culm it-relish, wiry, 1 2f; leaves short, narrowly 

 linear; spikes small (11") in several dense fascicles mostly terminal; sete 4 6, 

 shorter or longer than the obovoid brown ach. Wet, S. 



27 R. distant N. Like No. 26. but every way smaller; spikes 1" long, in a dense 

 terminal and often a distant lateral fascicle ; setae about equalling the ach. 8. 



28 R. clllata Vahl. Glaucous, 8' 2f; leaves short, linear, obtuse, ciliate ou the 

 edges ; spikes all in a dense lerniinal fascicle ; setae (i, half ihe length of the ach. S. 



29 R. palllda M. A. Curtis. Culm firmly erecl, 1 2f, 3-angled; spikes pale-tawny, 

 (like It. alba) in a dense terminrl head with often a lateral head on a long peduncle; 

 ach. roundish, tubercle minute, setae 3, minute. Bogs, N. J. lo N. C. 



SO IE. fusca R. & S. Culm (li 12') and leaves setaceous: spikes ovate-oblong, 2" 



